If your destination is east of Village Center Drive (shown in blue), use Yorba Linda Boulevard/Weir Canyon Road from the Riverside Freeway to get to and from your destination. If your destination is west of Village Center, use Imperial Highway to the greatest extent possible to get to and from your destination.
Mouth ulcers are caused by many disorders. These include: 1  Canker sores. 2  Gingivostomatitis. 3  Herpes simplex (fever blister). 4  Leukoplakia. 5  Oral cancer. 6  Oral lichen planus.
Causes. They are usually simple aphthous ulcers. A typical aphthous ulcer has a red rim with a greyish centre. Less frequently, they can be caused by Candida, herpes simplex, Kaposi's sarcoma, lymphoma or a low white cell count (neutropenia) and they may develop into bacterial infections. Treatment with ddC has been associated with the development of mouth ulcers in 15 to 30% of people who take the drug.